source-map name and "file" parameter are incorrect if multiple less files are compiled

[ai212983]

I have a number of .less files, all imported in site.main.less file.
lein less4j once properly creates site.css and map file named site.main.css.map (not site.css.map).
It works (because same file name is specified in site.css), but doesn't feel quite right and some tools fails to associate them properly.

Real bug is there's target file specified inside site.main.css.map:

"file":"devcards.main.css",

There's no such file, of course.

I am not sure if it is a Less4j or less4clj issue, but I believe "file" should point to site.css and it would be nice that name of the map file was matching css file (i.e. site.css.map, not site.main.css.map).

[Deraen]

Fixed in 0.7.4.